1235 code

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Sep 25, 2025 | 10:51 AM

Lowrate

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Cruising

Joined: Jul 2023

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From: Minnesota

1235 code

At my wits end. Replaced speed sensor (twice to be sure not defective), cleaned all connections, cleaned grounds, verified EBCM not at fault and wiring looks to be OK.
Where do I go from here?

Sep 25, 2025 | 12:21 PM

Alley Oop

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From: west coast of Canada

Your issue along with details should be entered in the Tech section along with details of your Vette.

Sep 25, 2025 | 12:47 PM

Vetteman Jack

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Moving this to C5 Tech.

Sep 25, 2025 | 01:24 PM

helga203

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Quote:

Originally Posted by Lowrate

At my wits end. Replaced speed sensor (twice to be sure not defective), cleaned all connections, cleaned grounds, verified EBCM not at fault and wiring looks to be OK.
Where do I go from here?

You need to check with DVM. Wires can look good but the contacts is where most of the problems are. Just went through this. Check omhs across to prongs in connector and voltage should be around then check voltage but rising tire and turn wheel. You shough see voltage (forgot what range) and i belive its A/C at the sensor connector. Must disconnect and just check the sensor side. If that all checks out you have a wire issue to the EBCM

Volts .5 to 1V 1000 to 2500omhs

Last edited by helga203; Sep 25, 2025 at 01:33 PM.

Sep 25, 2025 | 01:26 PM

helga203

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Sep 25, 2025 | 01:46 PM

C5 Diag

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From: Cape Coral, Florida

You can’t diagnose this by “looks to be OK”…if the flowchart testing is over your head seek an automotive electrical specialist…we can’t diagnose it for you.